Action of ejectment to recover possession of Whiteacre. P claims
to be the owner entitled to possession. D admits P's
possession but denies P's ownership. At trial, P proposes
to testify that D executed a deed by which he conveyed title
in fee simple absolute to P. D objects on best evidence grounds.

What ruling and why? What is so special about writings that there exists
a special rule of preference for them?